/*
  Week 10: Output Devices
  Project: I2C OLED Display (SSD1306)
  Microcontroller: XIAO ESP32C3
*/

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Screen dimensions in pixels
#define SCREEN_WIDTH 128 
#define SCREEN_HEIGHT 64 

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The reset pin is not used on most I2C OLED modules
#define OLED_RESET     -1 
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3C is common

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(115200);

  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }

  // Clear the buffer
  display.clearDisplay();

  // Set text color and size
  display.setTextSize(1);      
  display.setTextColor(SSD1306_WHITE); 
  
  // Display Hello Message
  display.setCursor(0, 0);     
  display.println(F("XIAO ESP32C3"));
  display.setCursor(0, 20);
  display.setTextSize(2);
  display.println(F("Success!"));
  display.setTextSize(1);
  display.setCursor(0, 50);
  display.println(F("Week 10: Output"));

  // Actually draw everything to the screen
  display.display(); 
}

void loop() {
  // Static display, no loop code needed
}